Content-Adaptive HDR Display Brightness Control
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Solution Overview
Problem
High dynamic range (HDR) content playback systems face challenges in efficiently rendering HDR content on display devices with varying brightness capabilities, leading to power consumption issues and quality degradation when HDR content is played back on standard dynamic range (SDR) or HDR devices that do not require the full brightness range.
Innovation Solution
A playback system that dynamically adjusts the brightness level of a target display device based on histogram information of HDR content, using decision logic to select an appropriate brightness level and tone mapping function, thereby reducing power consumption and improving video quality by ensuring sample values are rendered within the appropriate brightness range without time lag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If HDR content is played back on an SDR display device using full brightness range, then color vividness is improved, but power consumption increases and bright sample values are clipped
Solution Approach 1:
The playback system dynamically adjusts the brightness level of the SDR display device based on histogram information from the HDR content. Instead of using a fixed brightness mapping, the system determines an optimal brightness level that matches the actual luminance distribution of the content, allowing the display to operate at appropriate brightness levels rather than constantly at maximum, thus reducing power consumption while maintaining visual quality.
Solution Approach 2:
The system changes the brightness level parameter of the display device based on content characteristics. By analyzing the histogram of sample values in the HDR content and comparing it with the display's capabilities, the system adjusts the brightness mapping parameters to optimize both power consumption and visual quality, avoiding unnecessary high brightness operation.
2Use of energy by moving object
If HDR content is played back on an SDR display device with brightness clipping, then power consumption is reduced, but detail in bright sample values is lost
Solution Approach 1:
The system performs preliminary analysis of the HDR content by generating histogram information that describes the luminance distribution before playback. This advance characterization allows the playback system to pre-determine the optimal brightness level mapping, ensuring that bright sample values are appropriately represented without clipping while still optimizing power consumption based on the actual content requirements.
Solution Approach 2:
The system uses histogram information as feedback to adjust the brightness level mapping. By continuously monitoring the luminance distribution characteristics of the HDR content and comparing them with the SDR display capabilities, the system adapts the brightness transformation to preserve detail in bright regions while maintaining power efficiency.
3Measurement precision
If full brightness range is used for HDR content playback, then sample value representation is improved, but computational efficiency decreases and processing time increases
Solution Approach 1:
The system extracts only the essential luminance distribution characteristics from the HDR content by generating histogram information. Instead of processing all sample values with complex tone mapping algorithms, the system extracts the key brightness level information needed for optimal display, significantly reducing computational overhead while maintaining accurate sample value representation.
4Use of energy by moving object
If brightness level is adjusted based on histogram information, then power consumption is reduced and video quality is improved, but system complexity increases
Solution Approach 1:
The playback system performs self-adjustment by automatically analyzing the histogram information of the HDR content and determining the optimal brightness level mapping without requiring external intervention or complex control mechanisms. The system serves itself by using its own processing capabilities to characterize the content and adapt the display parameters, simplifying the overall control architecture.
Data Source
AI summary
Innovations in rendering of high dynamic range (“HDR”) content are described. A playback system can dynamically and proactively adjust the brightness level of a target display device. In some cases, this can reduce power consumption when rendering HDR content, without any noticeable degradation in quality. For example, the playback system includes decision logic. The decision logic is configured to receive summary information for sample values of a picture of HDR content and determine (based at least in part on the summary information) a brightness level of the target display device. The playback system can send, to the target display device, a control signal that indicates the brightness level of the target display device. A tone mapper can be configured to apply tone mapping to input values for the sample values of the picture of HDR content, according to a tone mapping function, and thereby produce output values.